US20180093451A1 - Sheet, moisture-proof method of adherend using the sheet and corrosion-proof method of metal plate using the sheet - Google Patents

Sheet, moisture-proof method of adherend using the sheet and corrosion-proof method of metal plate using the sheet Download PDF

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Publication number
US20180093451A1
US20180093451A1 US15/563,761 US201615563761A US2018093451A1 US 20180093451 A1 US20180093451 A1 US 20180093451A1 US 201615563761 A US201615563761 A US 201615563761A US 2018093451 A1 US2018093451 A1 US 2018093451A1
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United States
Prior art keywords
sheet
hardness
shore
less
elastomer layer
Prior art date
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Abandoned
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US15/563,761
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English (en)
Inventor
Derek JORGENSEN
Shinji Hoshino
Yu-Chu Chen
Masatoshi Suzuki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nitto Denko Corp
Nitto Inc
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Nitto Denko Corp
Nitto Inc
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Priority to US15/563,761 priority Critical patent/US20180093451A1/en
Assigned to NITTO DENKO CORPORATION, NITTO, INC. reassignment NITTO DENKO CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SUZUKI, MASATOSHI, HOSHINO, SHINJI, CHEN, YU-CHU, JORGENSEN, Derek
Publication of US20180093451A1 publication Critical patent/US20180093451A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C1/00—Fuselages; Constructional features common to fuselages, wings, stabilising surfaces or the like
    • B64C1/18—Floors
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/314—Applications of adhesives in processes or use of adhesives in the form of films or foils for carpets
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
    • C09J2301/124—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
    • C09J2301/1242—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape the opposite adhesive layers being different
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2427/00—Presence of halogenated polymer
    • C09J2427/006—Presence of halogenated polymer in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2471/00—Presence of polyether
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2475/00—Presence of polyurethane
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2483/00—Presence of polysiloxane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/14—Layer or component removable to expose adhesive
    • Y10T428/1476—Release layer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • Y10T428/2848—Three or more layers

Definitions

  • the present invention relates to a novel sheet simultaneously having superior adhesiveness to an adherend and superior re-peel property.
  • carpets of various materials and forms are generally laid on the floor panel of aircrafts for the purpose of walking ease, beauty, heat-retaining property and the like.
  • electrical components, electric wiring and the like are set under the floor panel, it is necessary to shut off the moisture and humidity from the floor panel so that the moisture will not penetrate under the floor panel.
  • the airframe constructional material under a floor panel (hereinafter to be also simply abbreviated as “constructional material”) cannot be easily exchanged during maintenance, and corrosion needs to be prevented even when moisture penetrates under the floor panel.
  • constructional material since floor panel and airframe constructional material of aircraft cargo room are more frequently exposed to moisture than those of the cabin, the anticorrosion property of the airframe constructional material of aircraft cargo room poses a more important problem.
  • an adhesive tape with high moisture-proof property is adhered to a floor panel and a carpet is laid thereon to shut off the floor panel from water and humidity.
  • an adhesive tape with high moisture-proof property for example, an adhesive tape using a polyether-based polyurethane is known (US2004/0070156 A1).
  • an adhesive tape used for the aforementioned application, superior adhesion to adherends is necessary to isolate floor panel and airframe constructional material as adherends from water and humidity (hereinafter “isolation from water and humidity” is also simply referred to as “moisture-proof”) and to prevent corrosion thereof.
  • isolation from water and humidity is also simply referred to as “moisture-proof”
  • an adhesive tape requires easy removability that permits easy re-peeling from an adherend (floor panel, constructional material etc.), and absence of development of an adhesive residue on peeling.
  • the present invention aims to provide a novel sheet simultaneously having superior adhesion to an adherend and superior re-peel property.
  • the “sheet” in the present invention also encompasses a “tape” according to usual practice.
  • the present inventors have conducted intensive studies and found that a sheet wherein at least one of the surface layers is constituted of an elastomer layer having a Shore A hardness of less than 40, and the elastomer layer has an adhesion force to stainless steel of not more than 11 oz/in at 90 degree peel strength can solve the above-mentioned problems, which resulted in the completion of the present invention.
  • the present invention provides the following.
  • the sheet of the above-mentioned [ 1 ] having a laminate constitution of elastomer layer having a Shore A hardness of less than 40/core material/pressure-sensitive adhesive layer.
  • the sheet of the above-mentioned [2] which is a double-faced adhesive sheet wherein a release liner is further laminated on the elastomer layer having a Shore A hardness of less than 40.
  • the sheet of the above-mentioned [2], wherein the core material is a fluororesin film.
  • the sheet of the above-mentioned [8], wherein the core material is a plastic film.
  • a moisture-proof method of an adherend comprising adhering the sheet of the above-mentioned [1] to the adherend, with the elastomer layer having a Shore A hardness of less than 40 of the sheet as an adhesive surface to the adherend.
  • the method of the above-mentioned [16] wherein the adherend is a floor panel and/or a constructional material in a transporter or structure.
  • the method of the above-mentioned [16] comprising, after said method, peeling the sheet from the adherend, performing said method using the peeled sheet, or using a newly prepared sheet of the above-mentioned [1].
  • a corrosion-proof method of a metal plate comprising adhering the sheet of the above-mentioned [1] to the metal plate, with the elastomer layer having a Shore A hardness of less than 40 of the sheet as an adhesive surface to the metal plate.
  • the adherend by adhering, to an adherend, the sheet with the elastomer layer having a Shore A hardness of less than 40 of the sheet as an adhesive surface to the adherend, the adherend can be placed in a superior close adhesion state to be isolated from humidity and water (including salt water). Therefore, an adherend in need of moisture-proof such as a floor panel of a transporter such as aircraft, boats and ships and the like, structure and the like, and a constructional material under a floor panel of an aircraft and the like can be isolated from humidity and water (including salt water) for a long term by adhering the sheet of the present invention to the adherend. In addition, since an adherend can be isolated from humidity and water (including salt water) for a long term, corrosion and discoloration of such sealed object can be prevented at a high level.
  • the sheet adhered to the adherend can be easily peeled off from the adherend. Therefore, a decrease (degradation) in the property of the sheet due to the peeling of the sheet can be suppressed, and the sheet can be reused. Since re-adhesion (once peeling and adhering again) in adhering work of a sheet can be performed rapidly, adhesion work of an adhesive tape (including re-doing of adhesion) can be performed efficiently.
  • the sheet of the present invention is a sheet of an embodiment including a laminate constitution of elastomer layer having a Shore A hardness of less than 40/core material/pressure-sensitive adhesive layer, for example, moisture-proof of a floor panel and an airframe constructional material can be achieved, and a floor panel and an airframe constructional material can be temporarily fixed (permanently fixed by fastening screw after temporary fixing) by adhering the surface of an elastomer layer having a Shore A hardness of less than 40 to the floor panel, and adhering the surface of the pressure-sensitive adhesive layer to the airframe constructional material.
  • a pressure-sensitive adhesive layer having the release liner is adhered to the floor panel, and the release liner is peeled off, the floor panel is placed on and pressed against an airframe constructional material with the elastomer layer having a Shore A hardness of less than 40 being opposed to the airframe constructional material, whereby the floor panel and airframe constructional material become moisture-proof and the floor panel can be simultaneously laid on the airframe constructional material. Therefore, a floor panel laying work can be performed efficiency.
  • a technique including adhering a pressure-sensitive adhesive layer to an airframe constructional material in advance and mounting a floor panel on an elastomer layer is also possible.
  • FIG. 1(A) is a schematic view of a roll shape of the sheet in the first form of the present invention
  • FIG. 1(B) is a partly-enlarged sectional view of the sheet shown in FIG. 1(A) .
  • FIG. 2(A) is a schematic view of a roll shape of the sheet in the first form of the present invention
  • FIG. 2(B) is a partly-enlarged sectional view of the sheet shown in FIG. 2(A) .
  • FIG. 3(A) is a schematic view of a roll shape of the sheet in the second form of the present invention
  • FIG. 3(B) is a partly-enlarged sectional view of the sheet shown in FIG. 3(A) .
  • FIG. 4(A) is a schematic view of a roll shape of the sheet in the third form of the present invention
  • FIG. 4(B) is a partly-enlarged sectional view of the sheet shown in FIG. 4(A) .
  • FIG. 5(A) is a schematic view of a roll shape of the sheet in the fourth form of the present invention
  • FIG. 5(B) is a partly-enlarged sectional view of the sheet shown in FIG. 5(A) .
  • FIG. 6(A) is a schematic view of a roll shape of the sheet in the fifth form of the present invention
  • FIG. 6(B) is a partly-enlarged sectional view of the sheet shown in FIG. 6(A) .
  • 1 is an elastomer layer having a Shore A hardness of less than 40
  • 2 is a core material
  • 3 is a pressure-sensitive adhesive layer
  • 4 is a release liner
  • 5 is a substrate
  • 10 - 15 are sheets
  • 51 - 56 are rolls.
  • the sheet of the present invention is mainly characterized in that it has an elastomer layer having a Shore A hardness of less than 40, and the adhesion force of the elastomer layer to stainless steel is not more than 11 oz/in at 90 degree peel strength.
  • a sheet constituted to have an elastomer layer having a Shore A hardness of less than 40, wherein the elastomer layer having a Shore A hardness of less than 40 has an adhesion force to stainless steel of not more than 11 oz/in at 90 degree peel strength can be a sheet showing superior adhesion to an adherend and superior re-peel property from the adherend, by adhering the sheet to the adherend, with the elastomer layer having a Shore A hardness of less than 40 as an adhesive surface to the adherend.
  • the Shore A hardness of the elastomer layer is measured according to ASTM D2240.
  • an elastomer press cured in a size of 6 in ⁇ 6 in ⁇ 0.07 at 177° C. for 5 min is used as a sample, ASKER Durometer Type A is pressed on the surface of the sample, and the value is taken as Shore A hardness.
  • the 90 degree peel strength which is an adhesion force to stainless steel of the elastomer layer is measured according to ASTM D1000.
  • a sample (a sheet cut into 1 inch width) is adhered to a SUS304 polished plate manufactured by Chemsultants International at room temperature by one reciprocation press with a 2 kgf roller and, after leaving for 30 min at room temperature from the adhesion, and the peel strength is measured at peel angle 90°, peel rate 2 in/min.
  • the surface of the polished plate is washed with gauze containing toluene, toluene is dried at room temperature and plate is adhered to a sample.
  • FIG. 1(B) , FIG. 2(B) show sheet 10 in the first form.
  • Sheet 10 has a laminate constitution of elastomer layer 1 having a Shore A hardness of less than 40/core material 2 /pressure-sensitive adhesive layer 3 .
  • Sheet 10 in the first form before use is generally roll 51 wherein an elastomer layer 1 having a Shore A hardness of less than 40 further laminated with a release liner 4 ( FIG. 1(B) ) is rolled up ( FIG. 1(A) ), or roll 52 wherein a pressure-sensitive adhesive layer 3 further laminated with a release liner 4 is laminated ( FIG. 2(B) ) is rolled up ( FIG. 2(A) ).
  • FIG. 3(B) shows sheet 11 in the second form.
  • Sheet 11 is a laminate having a laminate constitution of elastomer layer 1 having a Shore A hardness of less than 40/core material 2 /elastomer layer 1 having a Shore A hardness of less than 40.
  • Sheet 11 in the second form before use that is, before adhering sheet 11 to an adherend, is generally roll 53 wherein one of the elastomer layers 1 having a Shore A hardness of less than 40 further laminated with a release liner 4 ( FIG. 3(B) ) is rolled up.
  • FIG. 4(B) shows sheet 12 in the third form.
  • Sheet 12 is a single layer sheet having only an elastomer layer 1 having a Shore A hardness of less than 40.
  • Sheet 12 in the third form before use that is, before adhering sheet 12 to an adherend, is generally roll 54 wherein an elastomer layer 1 having a Shore A hardness of less than 40 further laminated with a release liner 4 ( FIG. 4(B) ) is rolled up.
  • Sheets 10 - 12 in the first—the third forms are what is called “double-faced adhesive sheets” wherein the double faces of the sheet become adhesive surfaces to an adherend.
  • the sheet of the present invention also includes what is called a “single-faced adhesive sheet” wherein only single face of the sheet is an adhesive surface to an adherend. As such single-faced adhesive sheet, sheets in the following form can be mentioned.
  • FIG. 5(B) shows sheet 13 in the fourth form.
  • Sheet 13 has a laminate constitution of elastomer layer 1 having a Shore A hardness of less than 40/core material 2 /elastomer layer 1 having a Shore A hardness of less than 40/substrate 5 .
  • Sheet 13 in the fourth form before use that is, before adhering sheet 13 to an adherend, is roll 55 which is rolled up with substrate 5 on the outside face ( FIG. 5(A) ).
  • FIG. 6(B) shows sheet 14 in the fifth form.
  • Sheet 14 has a laminate constitution of elastomer layer 1 having a Shore A hardness of less than 40/substrate 5 .
  • Sheet 14 in the fifth form before use that is, before adhering sheet 14 to an adherend, is roll 56 which is rolled up with substrate 5 on the outside face ( FIG. 6(A) ).
  • the sheet of the present invention is used by adhering an elastomer layer having a Shore A hardness of less than 40 to an adherend that should certain become moisture-proof.
  • An elastomer layer having a Shore A hardness of less than 40 is adhered to an adherend to place same in a superior close adhesion state capable of isolating the adherend from humidity and water (including salt water). Therefore, an adherend in need of moisture-proof such as a floor panel of a transporter such as aircraft, boats and ships and the like, structure and the like, and a constructional material under a floor panel of an aircraft and the like can be isolated from humidity and water (including salt water) for a long term by adhering the sheet of the present invention to the adherend.
  • an adherend can be isolated from humidity and water (including salt water) for a long term, corrosion and discoloration of such sealed object can be prevented at a high level.
  • the elastomer layer has a Shore A hardness of not less than 40, the sheet cannot be adherend in a superior close adhesion state capable of isolating the adherend from humidity and water (including salt water).
  • an adherend can be isolated from humidity and water (including salt water) by adhering a pressure-sensitive adhesive layer of a sheet, which affords a high adhesion force, to the adherend, the sheet cannot be easily peeled off from the adherend.
  • the Shore A hardness of the elastomer layer having a Shore A hardness of less than 40 is preferably not more than 39 and, to impart initial adhesiveness (tackiness), it is more preferably not more than 30. While the lower limit of the Shore A hardness is not particularly limited, not less than 0.5 is preferable, and not less than 1 is more preferable.
  • the sheet of the present invention is a sheet having an elastomer layer having a Shore A hardness of less than 40 and an adhesion force to stainless steel of not more than 11 oz/in at 90 degree peel strength. Since the adhesion force of the elastomer layer to stainless steel is not more than 11 oz/in at 90 degree peel strength, the sheet adhered to an adherend with the surface of the elastomer layer having a Shore A hardness of less than 40 as an adhesive surface to the adherend adheres to the adherend in a good close adhesion state to the adherend and can be easily peeled when detached.
  • the 90 degree peel strength of an elastomer layer having a Shore A hardness of less than 40 to stainless steel is preferably not more than 5 oz/in, more preferably not more than 3 oz/in.
  • the 90 degree peel strength is preferably not less than 1 oz/in.
  • An adhesion target of pressure-sensitive adhesive layer 3 of sheet 10 in the first form, and an adhesion target of one of two elastomer layers 1 having a Shore A hardness of less than 40 of sheet 11 in the second form may be an adherend that does not necessarily require moisture-proof or anticorrosion, or an adherend that does not necessarily require re-peeling of the adhered sheet.
  • sheet 11 in the second form when two elastomer layers 1 having a Shore A hardness of less than 40 are each adhered to an adherend requiring moisture-proof or anticorrosion, moisture-proof and anticorrosion of two adherends can be achieved by isolating each adherend from humidity and water (including salt water), and the sheet can be easily peeled off from the two adherends.
  • the sheet 13 in the fourth form i.e., sheet having laminate constitution of elastomer layer 1 having a Shore A hardness of less than 40/core material 2 /elastomer layer 1 having a Shore A hardness of less than 40/substrate 5
  • a material for elastomer layer formation is coated twice, a sheet having an elastomer layer with a thickness (total thickness) that cannot be provided by single coating can be advantageously obtained.
  • Examples of the “adherend” in the present invention include various metal members such as aluminum, duralumin, iron, steel (stainless steel, carbon steel (common steel), nickel-chrome steel, nickel-chrome-molybdenum steel, chrome steel, chrome-molybdenum steel, manganese steel etc.) and the like; various plastic members; various glass-fiber-reinforced plastic (GFRP) members such as glass-cloth-reinforced epoxy-impregnated aramid resin and the like; various carbon-fiber-reinforced plastic (CFRP) members such as carbon-fiber-reinforced epoxy-impregnated aramid resin and the like; and the like.
  • GFRP glass-fiber-reinforced plastic
  • CFRP carbon-fiber-reinforced plastic
  • adherend to be moisture-proof examples include various metal members (board, rod, pipe etc.) such as airframe constructional material of aircraft and the like, floor panel (material: aluminum, duralumin, stainless steel, glass-fiber-reinforced plastics (GFRP), carbon-fiber-reinforced plastic (CFRP) etc.) of transporters such as aircraft and the like, structure and the like, and the like.
  • metal members board, rod, pipe etc.
  • floor panel material: aluminum, duralumin, stainless steel, glass-fiber-reinforced plastics (GFRP), carbon-fiber-reinforced plastic (CFRP) etc.
  • An adherend that does not necessarily require moisture-proof or anticorrosion, and an adherend that does not necessarily require re-peeling of the adhered sheet, which are the adhesion targets of the pressure-sensitive adhesive layer 3 of sheet 10 in the first form, and one of the two elastomer layers 1 having a Shore A hardness of less than 40 of sheet 11 in the second form, are not particularly limited, and members of various materials in various forms can be mentioned.
  • sheet 10 in the first form for example, moisture-proof of floor panel and airframe constructional material can be achieved, as well as floor panel and airframe constructional material can be temporarily fixed (permanently fixed by fastening screw after temporary fixing) by adhering the surface of elastomer layer 1 having a Shore A hardness of less than 40 to a floor panel and adhering the surface of pressure-sensitive adhesive layer 3 to an airframe constructional material.
  • a pressure-sensitive adhesive layer having the release liner is adhered to the floor panel, and the release liner is peeled off, the floor panel is placed on and pressed against an airframe constructional material with the elastomer layer having a Shore A hardness of less than 40 being opposed to the airframe constructional material, whereby the floor panel and airframe constructional material become moisture-proof and the floor panel can be simultaneously laid on the airframe constructional material. Therefore, a floor panel laying work can be performed efficiency.
  • a technique including adhering a pressure-sensitive adhesive layer to an airframe constructional material in advance and mounting a floor panel on an elastomer layer is also possible.
  • one of the surface layers is elastomer layer 1 having a Shore A hardness of less than 40, and the other surface layer is substrate 5 .
  • Substrate 5 imparts a sheet with self-supporting property, and improves resistance of the sheet to water permeability. Since elastomer layer 1 having a Shore A hardness of less than 40 shows superior adhesion to an adherend, and substrate 5 increases resistance of the sheet to water permeability, when the sheet is adhered to an adherend to be moisture-proof, the adherend can be isolated from humidity and water (including salt water) more effectively. In addition, substrate 5 increases the strength of the sheet (tensile strength, tear strength etc.), and an effect of suppressing tearing during adhesion and peeling of the sheet can be obtained.
  • Sheet 10 in the first form (sheet having laminate constitution of elastomer layer 1 having a Shore A hardness of less than 40/core film 2 /pressure-sensitive adhesive layer 3 ) ⁇ Elastomer Layer 1 Having a Shore a Hardness of Less than 40>
  • the “elastomer layer” in the present invention is a concept including not only a rubber layer formed from a rubber which is a polymer substance having elasticity due to a crosslinked structure, but also a layer formed from an uncrosslinked polymer substance showing the property of rubber elastic body at ambient temperature.
  • elastomer layer 1 having a Shore A hardness of less than 40 is preferably a rubber layer having Shore A hardness of less than 40, and from the aspects of durability, flame retardancy, waterproof property and the like of the material, a silicone rubber layer or urethane rubber layer having a Shore A hardness of less than 40 is more preferable, and a silicone rubber layer having a Shore A hardness of less than 40 is particularly preferable.
  • silicone rubber layer having a Shore A hardness of less than 40 a silicone rubber having a Shore A hardness of less than 40 which is obtained by curing a conventionally-known silicone rubber composition can be applied.
  • the silicone rubber composition may be of any curing type, since forming can be achieved in a short time by heating, one obtained from an addition (hydrosilylation) reaction curing type silicone rubber composition or an organic peroxide curing type silicone rubber composition is preferable.
  • the addition reaction curing type silicone rubber composition may have a known composition, and one containing alkenyl group-containing organopolysiloxane having two or more alkenyl groups represented by a vinyl group in one molecule, organohydrogen polysiloxane having two or more, preferably three or more, SiH groups (generally, in an amount corresponding to molar ratio of SiH group of 0.5-4 to alkenyl group), and platinum or a platinum group metal addition reaction catalyst represented by a platinum compound (generally, 1-1,000 ppm relative to alkenyl group-containing organopolysiloxane) is used.
  • an organic peroxide curing type silicone rubber composition may be a known composition, and organopolysiloxane having two or more alkenyl groups in one molecule added with a cure effective amount (generally, 1-10 parts by mass per 100 parts by mass of the above-mentioned organopolysiloxane) of organic peroxide as a curing agent is preferably used.
  • a silicone rubber having a Shore A hardness of less than 40 may be a commercially available product and, for example, SILBIONE LSR 6301 (Shore A hardness: 1), LSR 6305 (Shore A hardness: 5) manufactured by Bluestar Silicones, Elastosil 3003/30 (Shore A hardness: 30) manufactured by Wacker Chemie, 3631 (Shore A hardness:19) manufactured by DOW, and the like can be mentioned.
  • the urethane rubber layer having a Shore A hardness of less than 40 is a layer formed from a cured product having a Shore A hardness of less than 40 (urethane rubber) obtained by reacting and curing a polyurethane composition.
  • urethane rubber urethane rubber
  • the composition of the polyurethane composition only needs to be appropriately selected.
  • the polyurethane composition is composed of polyisocyanate such as diisocyanate or triisocyanate and the like and polyol such as diol or triol and the like.
  • polyisocyanate is not particularly limited, and examples thereof include diisocyanates such as 4,4′-diphenylmethane diisocyanate (MDI), 2,4-tolylene diisocyanate (2,4-TDI), 2,6-tolylene diisocyanate (2,6-TDI), 3,3′-bitolylene-4,4′-diisocyanate, 3,3′-dimethyldiphenylmethane-4,4′-diisocyanate, 2,4-tolylene diisocyanate uretidinedione (2,4-TDI dimer), 1,5-naphthylene diisocyanate, methaphenylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, 4,4′-dicyclohexylmethane diisocyanate (hydrogenated MDI), carbodiimide-modified MDI, orthotoluidine diisocyanate, x
  • the polyol to be used along with the above-mentioned polyisocyanate is not particularly limited, and examples thereof include polyester polyol such as polyester diol, polyester triol and the like, polycaprolactone, polycarbonate, polyetherpolyol such as polyoxytetramethylene glycol, polyoxypropylene glycol and the like, and the like. These may be used alone or two or more kinds thereof may be used in combination.
  • polyester polyol hydroxylpolyester polyol produced from polybasic organic acid and polyol and having a hydroxyl group as the terminal group is preferably used.
  • polybasic organic acid include dicarboxylic acids such as saturated fatty acids such as oxalic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, isosebacic acid and the like, unsaturated fatty acids such as maleic acid, fumaric acid and the like, aromatic acids such as phthalic acid, isophthalic acid, terephthalic acid and the like, and the like, acid anhydrides such as maleic anhydride, phthalic anhydride and the like, dialkyl esters such as dimethyl terephthalate and the like, dimer acid obtained by dimerization of unsaturated fatty acid and the like.
  • dicarboxylic acids such as saturated fatty acids such as oxalic acid, succinic acid
  • Examples of the polyol to be used along with the above-mentioned polybasic organic acid include diols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, butylene glycol, neopentyl glycol, 1,6-hexylene glycol and the like, triols such as trimethylolethane, trimethylolpropane, hexane triol, glycerol and the like, hexaols such as sorbitol and the like, and the like.
  • diols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, butylene glycol, neopentyl glycol, 1,6-hexylene glycol and the like
  • triols such as trimethylolethane, trimethylolpropane, hexane triol, glycerol and the like
  • polyetherpolyol one produced by ring opening polymerization or copolymerization of cyclic ether is preferably used.
  • examples of the above-mentioned cyclic ether include ethylene oxide, propylene oxide, trimethylene oxide, butylene oxide, ⁇ -methyltrimethylene oxide, 3,3′-dimethyltrimethylene oxide, tetrahydrofuran, dioxane, dioxamin and the like.
  • the number average molecular weight (Mn) of polyol to be used along with the above-mentioned polyisocyanate is preferably 1500-3000, particularly preferably 1500-2500. That is, when the above-mentioned polyol has an Mn of less than 1500, the property of the obtained urethane rubber layer tends to decrease, and when Mn exceeds 3000, the workability tends to be degraded.
  • the polyurethane composition may appropriately contain, in addition to polyisocyanate and polyol, chain extender, catalyst, foaming agent, surfactant, flame retardant, colorant, filler, plasticizer, stabilizer, mold release agent and the like.
  • a urethane rubber layer is formed by reacting and curing a polyurethane composition by cast molding (specifically, prepolymer method, semi-one-shot method, one-shot method) to give a sheet-like cured product.
  • Elastomer layer 1 having a Shore A hardness of less than 40 can contain a flame retardant.
  • the flame retardant is not particularly limited, a halogen-free flame retardant which does not produce a toxic halogen gas, is preferable and, for example, known flame retardants free of halogen atom such as hydrated metal compound-based flame retardants, inorganic compound-based flame retardants, phosphorus flame retardant, silicone-based flame retardant, nitrogen compound-based flame retardants, organic metal compound-based flame retardants and the like can be used.
  • known flame retardants free of halogen atom such as hydrated metal compound-based flame retardants, inorganic compound-based flame retardants, phosphorus flame retardant, silicone-based flame retardant, nitrogen compound-based flame retardants, organic metal compound-based flame retardants and the like can be used.
  • phosphorus flame retardants are preferable since they can impart a flame retardancy effect and are superior in the suppression of drip during combustion, compatibility to environmental regulation and the like.
  • the aforementioned silicone rubber composition or polyurethane composition can contain a flame retardant.
  • a flame retardant is preferably contained in about 10-100 parts by weight per 100 parts by weight of the silicone rubber composition or polyurethane composition.
  • the thickness of the elastomer layer 1 having a Shore A hardness of less than 40 is preferably 2-40 mil, more preferably 15-35 mil.
  • the thickness of the elastomer layer 1 is within such preferable range, the maintenance of a wrapped state of a roll product and handling property as a tape become more superior.
  • the material of core material 2 is not particularly limited. Examples thereof include a single layer or laminate plastic film made from one or more kinds selected from polyester (e.g., poly(ethylene terephthalate) (PET) and the like); nylon; polyvinyl chloride; polyvinylidene chloride; polyolefin (e.g., polyethylene, polypropylene, reactor TPO, ethylene-vinyl acetate copolymer and the like); fluororesin (e.g., polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene (PCTFE), polyvinylidene fluoride (PVDF), polyvinyl fluoride (PVF), perfluoroalkoxy fluororesin (PFA), tetrafluoroethylene hexafluoropropylene copolymer (FEP), ethylene tetrafluoroethylene copolymer (ETFE), ethylene chlorotrifluoroethylene copolymer (ECTFE) and the like) and
  • a fiber sheet (a single layer sheet, laminated sheet of two or more layers) such as knitted fabric, woven fabric, non-woven fabric and the like using one or more kinds of fibers selected from synthetic polymer fibers such as polyester (e.g., poly(ethylene terephthalate) (PET) and the like) and the like, natural fibers such as cotton, hemp and the like, metal fiber and glass fiber, and a laminated sheet wherein one or more kinds of such fiber sheets are laminated on the aforementioned plastic film can also be used as a substrate sheet 1 .
  • synthetic polymer fibers such as polyester (e.g., poly(ethylene terephthalate) (PET) and the like) and the like
  • natural fibers such as cotton, hemp and the like
  • metal fiber and glass fiber and a laminated sheet wherein one or more kinds of such fiber sheets are laminated on the aforementioned plastic film
  • nonporous film means a solid film excluding mesh cloth, woven fabric, non-woven fabric, mesh film (sheet), perforated film (sheet) and the like. From the aspects of moisture-proof property, flame retardancy, flexibility and the like, preferred is a fluororesin film (solid), and more preferred is a PTFE film (solid).
  • a glass fiber sheet For penetrate bolting after sheet configuration and the like, from the aspects of workability of bolting, imparting strength on peeling and the like, a glass fiber sheet (particularly glass cloth) is preferable.
  • the fabric weight of glass fiber sheet is preferably 5-1000 g/m 2 from the aspects of the strength and transparency of the sheet, and the thickness (diameter) of the glass fiber is preferably abut 0.4-39 mil.
  • the form thereof may be, for example, plain weave, satin weave, twill weave, mat weave and the like.
  • the adhesiveness of the glass cloth to an elastomer layer can be improved by a surface treatment with a silane coupling agent.
  • the thickness of the core material 2 is not particularly limited, to obtain sheet 10 in the first form having an elastomer layer 1 having a Shore A hardness of less than 40 and an adhesion force to stainless steel of not more than 11 oz/in at 90 degree peel strength, 0.5-10 mil is preferable, 2-7 mil is more preferable. While the thickness of the core material 2 is within such preferable range, the maintenance of a wrapped state of a roll product and handling efficiency as a tape are further improved.
  • the pressure-sensitive adhesive to be used for the pressure-sensitive adhesive layer 3 is not particularly limited, and acrylic, silicone-based, natural rubber-based, synthetic rubber-based, polyoxyalkylene-based adhesives and the like can be mentioned. Of these, a polyoxyalkylene-based adhesive is preferable.
  • the polyoxyalkylene-based adhesive is superior in high adhesion force, moisture-proof property, and concave convex adaptability.
  • an acrylic adhesive containing, as a base polymer, an acrylic polymer with a monomer unit of alkyl(meth)acrylate as a main backbone is preferable (here, the “(meth)acrylate” means “acrylate and/or methacrylate”).
  • the average carbon number of the alkyl group of the alkyl(meth)acrylate constituting the main backbone of the acrylic polymer is preferably about 1 to 18.
  • alkyl(meth)acrylate include methyl(meth)acrylate, ethyl(meth)acrylate, n-butyl(meth)acrylate, 2-ethylhexyl(meth)acrylate, isooctyl(meth)acrylate, isononyl (meth)acrylate, lauryl (meth)acrylate and the like.
  • alkyl(meth)acrylate wherein the carbon number of the alkyl group is 1 to 12 is preferable.
  • One or more kinds of various monomers may be introduced into an acrylic polymer by copolymerization to improve adhesiveness to a sealed object and heat resistance of the pressure-sensitive adhesive sheet containing a non-halogenated flame retardant.
  • copolymerizable monomer include monomers containing a hydroxyl group such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 10-hydroxydecyl (meth)acrylate, 12-hydroxylauryl (meth)acrylate, (4-hydroxymethylcyclohexyl)methyl (meth)acrylate and the like; monomers containing a carboxyl group such as (meth)acrylic acid, carboxyethyl(meth)acrylate, carboxypentyl(meth)acrylate, itaconic acid, maleic acid, fumaric acid, crot
  • nitrogen containing vinyl monomers can be mentioned, for example, maleimide, N-cyclohexylmaleimide, N-phenylmaleimide; N-acryloylmorpholine; (N-substituted) amide monomers such as (meth)acrylamide, N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N-hexyl(meth)acrylamide, N-methyl(meth)acrylamide, N-butyl(meth)acrylamide, N-butyl(meth)acrylamide, N-methylol(meth)acrylamide, N-methylolpropane(meth)acrylamide and the like; alkylaminoalkyl (meth)acrylate monomers such as aminoethyl (meth)acrylate, aminopropyl (meth)acrylate, N,N-dimethylaminoethyl (meth)acrylate, t-butylaminoethyl (me)
  • vinyl monomers such as vinyl acetate, vinyl propionate, N-vinylpyrrolidone, methylvinylpyrrolidone, vinylpyridine, vinylpiperidone, vinylpyrimidine, vinylpiperazine, vinylpyrazine, vinylpyrrole, vinylimidazole, vinyloxazole, vinylmorpholine, N-vinylcarboxylic acid amides, styrene, ⁇ -methylstyrene, N-vinylcaprolactam and the like; cyanoacrylate monomers such as acrylonitrile, methacrylonitrile and the like; epoxy group-containing acrylic monomers such as glycidyl (meth)acrylate and the like; glycol acrylate monomers such as polyethylene glycol (meth)acrylate, polypropylene glycol (meth)acrylate, methoxyethylene glycol (meth)acrylate, methoxypolypropylene glycol (meth)acrylate and the like; acrylate monomers such as t
  • an isocyanate-based crosslinking agent when used as a crosslinking agent, a hydroxyl group-containing monomer is preferable since the reactivity with the isocyanate group is good.
  • Carboxyl group-containing monomers such as (meth)acrylic acid and the like are preferable in view of the adhesiveness to a sealed object, adhesion durability, weatherability and the like of the flame retardant-containing pressure-sensitive adhesive sheet, and acrylic acid is particularly preferable.
  • the weight ratio of the copolymerizable monomer in the acrylic polymer is preferably about 0.1-10 wt %.
  • the weight average molecular weight of the acrylic polymer is generally about 300,000 to 2,500,000.
  • Acrylic polymers are produced by various known methods and, for example, radical polymerization methods such as bulk polymerization method, solution polymerization method, suspension polymerization method and the like can be appropriately employed.
  • radical polymerization initiator various known azo-based initiators and peroxide-based initiators can be used.
  • the reaction temperature is generally about 50 to 80° C., and the reaction time is 1 to 8 hr.
  • the acrylic adhesive can contain a crosslinking agent in addition to a base polymer, and the crosslinking agent can improve adhesion to an optical board and durability, and can provide reliability at a high temperature and maintain the form of the adhesive itself.
  • a known crosslinking agent such as isocyanate-based crosslinking agents, epoxy-based crosslinking agents, peroxide-based crosslinking agents, metal chelate-based crosslinking agents, oxazoline-based crosslinking agents and the like can be appropriately used.
  • One or more kinds of these crosslinking agents can be used in combination.
  • the amount of the crosslinking agent to be used is not more than 10 parts by weight, preferably 0.01-5 parts by weight, more preferably 0.02-3 parts by weight, relative to 100 parts by weight of the acrylic polymer.
  • a ratio of the crosslinking agent exceeding 10 parts by weight is not preferable, since crosslinking may proceed too much to decrease adhesiveness.
  • the silicone-based adhesive is not particularly limited, and peroxide crosslinking type silicone-based adhesives (peroxide curing type silicone-based adhesive) and addition reaction type silicone-based adhesives, which are generally used, can be preferably used. These peroxide crosslinking type silicone-based adhesives and addition reaction type silicone-based adhesives may be commercially available products. Specific examples of the peroxide crosslinking type silicone-based adhesive include KR-3006A/BT manufactured by Shin-Etsu Chemical Co., Ltd., SH 4280 PSA manufactured by Toray Dow Corning Corporation Silicone and the like.
  • addition reaction type silicone-based adhesive examples include X-40-3501 manufactured by Shin-Etsu Chemical Co., Ltd., BY 24-712 manufactured by Toray Dow Corning Corporation Silicone, TSE32X manufactured by GE Toshiba Silicones Co., Ltd. and the like.
  • a cured product of a composition containing the following components A-C is preferable:
  • A a polyoxyalkylene polymer having at least one alkenyl group in one molecule
  • polyoxyalkylene polymer having at least one alkenyl group in one molecule is not particularly limited, and various polymers can be used. However, one wherein the main chain of the polymer has a repeat unit represented by the formula (1) shown below is preferable:
  • R 1 is an alkylene group.
  • R 1 is preferably a linear or branched alkylene group having 1 to 14, more preferably 2 to 4, carbon atoms.
  • the main chain skeleton of the polyoxyalkylene polymer may consist of only one kind of repeat unit, and may consist of two kinds or more of repeat units. Particularly, from the aspects of availability and workability, a polymer having —CH 2 CH(CH 3 )O— as a main repeat unit is preferable.
  • a repeat unit other than the oxyalkylene group may be contained in the main chain of the polymer.
  • the total sum of oxyalkylene units in the polymer is preferably not less than 80% by weight, particularly preferably not less than 90% by weight.
  • the polymer of component A may be a linear polymer or a branched polymer, or a mixture thereof, it preferably contains a linear polymer in a proportion of not less than 50% by weight, so that the adhesive layer will show good adhesiveness to the surface of various materials.
  • the molecular weight of the polymer of component A is preferably 500 to 50,000, more preferably 5,000 to 30,000, in terms of number-average molecular weight.
  • the number average molecular weight here means the value obtained by a gel permeation chromatography (GPC) method.
  • the polymer of component A preferably has a narrow molecular weight distribution wherein the ratio of weight-average molecular weight and number-average molecular weight (Mw/Mn) is not more than 1.6; a polymer having an Mw/Mn of not more than 1.6 produces a decreased viscosity of the composition and offers improved workability.
  • Mw/Mn is more preferably not more than 1.5, still more preferably not more than 1.4.
  • Mw/Mn refers to a value obtained by a gel permeation chromatography (GPC) method.
  • the molecular weight (based on polystyrene) is measured by the GPC method using GPC apparatus (HLC-8120GPC) manufactured by Tosoh Corporation, where the measurement conditions are as follows.
  • alkenyl group is not subject to limitation, but an alkenyl group represented by the formula (2) shown below is suitable:
  • R 2 is hydrogen or a methyl group.
  • the mode of binding of the alkenyl group to the polyoxyalkylene polymer is not subject to limitation; for example, alkenyl group direct bond, ether bond, ester bond, carbonate bond, urethane bond, urea bond and the like can be included.
  • R 4a in the formula specifically, —CH 2 —, —CH 2 CH 2 —, —CH 2 CH 2 CH 2 —, —CH 2 CH(CH 3 ) CH 2 —, —CH 2 CH 2 CH 2 CH 2 —, —CH 2 CH 2 OCH 2 CH 2 —, or —CH 2 CH 2 OCH 2 CH 2 CH 2 — and the like can be included; for the ease of synthesis, —CH 2 — is preferable.
  • a polymer having an ester bond represented by the formula (4): ⁇ H 2 C ⁇ C(R 3b )—R 4b —OCO ⁇ a 2 R 5b
  • R 3b , R 4b , R 5b and a 2 have the same definitions as those of R 3a , R 4a , R 5a and a 1 , respectively, can also be included.
  • a polymer having a carbonate bond represented by the formula (6): ⁇ H 2 C ⁇ C(R 3d )—R 4d —O(CO)O ⁇ a 4 R 5d wherein R 3d , R 4d , R 5d and a 4 have the same definitions as those of R 3a , R 4a , R 5a and a 1 , respectively,
  • alkenyl groups be present in one molecule of the polymer of component A. If the number of alkenyl groups contained in one molecule of the polymer of component A is less than 1, the curing is insufficient; if the number exceeds 5, the mesh structure becomes so dense that the polymer sometimes fails to exhibit a good adherence.
  • the polymer of component A can be synthesized according to the method described in JP-A-2003-292926, and any commercially available product can be used.
  • Particularly preferable embodiment of the polymer of component A includes terminus-allylated polyoxypropylene wherein an allyl group is bonded to both terminals of polypropylene glycol.
  • any component B “compound containing two or more hydrosilyl groups on average in one molecule” can be used without limitation, as long as it has a hydrosilyl group (a group having an Si—H bond), but from the viewpoint of the ease of obtainment of raw materials and compatibility with the component A, an organohydrogen polysiloxane modified with an organic constituent is particularly preferable.
  • the aforementioned polyorganohydrogen siloxane modified with an organic constituent more preferably has an average of 2 to 8 hydrosilyl groups in one molecule.
  • Specific examples of the structure of the polyorganohydrogen siloxane include linear or cyclic ones represented by, for example,
  • R 6a is a hydrocarbon group having 2 to 20 carbon atoms in the main chain thereof, optionally comprising one or more phenyl groups,
  • R 6b is a hydrocarbon group having 2 to 20 carbon atoms in the main chain thereof, optionally comprising one or more phenyl groups, or
  • R 6c is a hydrocarbon group having 2 to 20 carbon atoms in the main chain thereof, optionally having one or more phenyl groups, and the like, and ones having two or more of these units, represented by the following:
  • R 6d is a hydrocarbon group having 2 to 20 carbon atoms in the main chain thereof, optionally having one or more phenyl groups, 2 ⁇ b 1 , R 8a is a divalent to tetravalent organic group, and R 7a is a divalent organic group, but R 7a may be absent depending on the structure of R 8a ,
  • R 6e is a hydrocarbon group having 2 to 20 carbon atoms in the main chain thereof, optionally having one or more phenyl groups, 2 ⁇ b 2 , R 8b is a divalent to tetravalent organic group, and R 7b is a divalent organic group, however, R 7b may be absent depending on the structure of R 8b , or
  • R 6f is a hydrocarbon group having 2 to 20 carbon atoms in the main chain thereof, optionally comprising one or more phenyl groups, 2 ⁇ b 3 , R 8c is a divalent to tetravalent organic group, and R 7c is a divalent organic group, however, R 7c may be absent depending on the structure of R 8c , and the like.
  • the “compound containing two or more hydrosilyl groups on average in one molecule” for component B preferably has good compatibility with the component A and the component C, or good dispersion stability in the system. Particularly, if the viscosity of the entire system is low, use of an ingredient whose compatibility with any of the above-described ingredients is low as the component B sometimes causes phase separation and a curing failure.
  • the component B having relatively good compatibility with the component A and the component C, or relatively good dispersion stability, the following can be included.
  • n 7 is an integer of not less than 4 and not more than 10,
  • R 6g is a hydrocarbon group having eight or more carbon atoms.
  • polymethylhydrogen siloxane can be included; for assuring compatibility with the component A and adjusting the SiH content, a compound modified with ⁇ -olefin, styrene, ⁇ -methylstyrene, allylalkyl ether, allylalkyl ester, allylphenyl ether, allylphenyl ester or the like can be included; as an example, the following structure can be included.
  • the component B can be synthesized by a commonly known method, and any commercially available product can be used.
  • any component C “hydrosilylation catalyst” is not subject to limitation; an optionally chosen one can be used.
  • chloroplatinic acid elemental platinum
  • a platinum-vinylsiloxane complex ⁇ for example, Pt n (ViMe 2 SiOSiMe 2 Vi) m , Pt[(MeViSiO) 4 ] m and the like ⁇
  • a platinum-phosphine complex ⁇ for example, Pt(PPh 3 ) 4 , Pt(PBu 3 ) 4 and the like ⁇
  • a platinum-phosphite complex for example, Pt[P(OPh) 3 ] 4 , Pt[P(OBu) 3 ] 4 and the like ⁇
  • Pt(acac) 2 the platinum-hydrocarbon composite described in U.S.
  • RhCl(PPh 3 ) 3 RhCl 3 , Rh/Al 2 O 3 , RuCl 3 , IrCl 3 , FeCl 3 , AlCl 3 , PdCl 2 . 2H 2 O, NiCl 2 , TiCl 4 and the like can be included.
  • catalysts may be used alone, and may be used in combination of two kinds or more.
  • chloroplatinic acid a platinum-phosphine complex, a platinum-vinylsiloxane complex, Pt(acac) 2 and the like are preferable.
  • the amount of the component C formulated is not subject to limitation, from the viewpoint of assurance of composition potlife and transparency of the cured product (adhesive layer), the amount is generally not more than 1 ⁇ 10 ⁇ 1 mol, preferably not more than 5.3 ⁇ 10 ⁇ 2 mol, relative to 1 mol of alkenyl groups in the component A; particularly, from the viewpoint of transparency of the cured product (adhesive layer), the amount is more preferably not more than 3.5 ⁇ 10 ⁇ 2 mol, particularly preferably not more than 1.4 ⁇ 10 ⁇ 3 mol.
  • the amount exceeds 1 ⁇ 10 ⁇ 1 mol relative to 1 mol of alkenyl groups in the component A, the finally obtained cured product (adhesive layer) is likely to undergo yellowing and the transparency of the cured product (adhesive layer) tends to be damaged.
  • the amount of the component C formulated is too low, the composition curing speed is slow, and the curability tends to be unstable; therefore, the amount is preferably not less than 8.9 ⁇ 10 ⁇ 5 mol, more preferably not less than 1.8 ⁇ 10 ⁇ 4 mol.
  • the composition comprising the above-described components A to C is cured by heating. That is, the alkenyl group of component A (polyoxyalkylene polymer having at least one alkenyl group in one molecule) is hydrosilylated by the hydrosilyl group (group having Si—H bond) of component B (compound containing two or more hydrosilyl groups on average in one molecule) in the presence of a hydrosilylation catalyst (component C) to allow crosslinking to proceed, whereby curing is completed.
  • component A polyoxyalkylene polymer having at least one alkenyl group in one molecule
  • component B compound containing two or more hydrosilyl groups on average in one molecule
  • component C hydrosilylation catalyst
  • component A and component B be contained so that the functional group ratio of the hydrosilyl groups groups of component B (compound B) to the alkenyl groups of component A (compound A) will be not less than 0.3 and less than 2, more preferably not less than 0.4 and less than 1.8, and still more preferably not less than 0.5 and less than 1.5.
  • the functional group ratio will exceed 2, the crosslinking density increases, and it is sometimes impossible to obtain adhesiveness.
  • the functional group ratio is less than 0.3, crosslinking in the cured product becomes too weak, and retention of characteristics at high temperatures may become difficult.
  • the pressure-sensitive adhesive layer 3 can contain a flame retardant.
  • a flame retardant is not particularly limited, a halogen-free flame retardant which does not produce a toxic halogen gas, is preferable and, for example, known flame retardants free of halogen atom such as hydrated metal compound-based flame retardants, inorganic compound-based flame retardants, phosphorus flame retardant, silicone-based flame retardant, nitrogen compound-based flame retardants, organic metal compound-based flame retardants and the like can be used.
  • known flame retardants free of halogen atom such as hydrated metal compound-based flame retardants, inorganic compound-based flame retardants, phosphorus flame retardant, silicone-based flame retardant, nitrogen compound-based flame retardants, organic metal compound-based flame retardants and the like can be used.
  • phosphorus flame retardants are preferable since they can impart a flame retardancy effect and are superior in the suppression of drip during combustion, compatibility to environmental regulation and the like.
  • the amount thereof to be used varies depending on the kind
  • the pressure-sensitive adhesive layer 3 can contain a tackifier resin.
  • the tackifier resin include terpene tackifier resin, phenol-based tackifier resin, rosin-based tackifier resin, petroleum-based tackifier resin and the like.
  • One or more kinds of tackifier resin can be used.
  • terpene-based tackifier resin examples include terpene-based resins such as ⁇ -pinene polymer, ⁇ -pinene polymer, dipentene polymer and the like, modified terpene-based resins (e.g., terpenephenol-based resin, styrene-modified terpene-based resin, aromatic-modified terpene-based resin, hydrogenated terpene-based resin etc.) obtained by modifying (phenol-modification, aromatic-modification, hydrogenated-modification, hydrocarbon-modification etc.) these terpene-based resins, and the like.
  • modified terpene-based resins e.g., terpenephenol-based resin, styrene-modified terpene-based resin, aromatic-modified terpene-based resin, hydrogenated terpene-based resin etc.
  • phenol-based tackifier resin examples include condensates (e.g., alkylphenolic resin, xyleneformaldehyde-based resin and the like) of various phenols (e.g., phenol, m-cresol, 3,5-xylenol, p-alkylphenol, resorcin etc.) and formaldehyde, resol obtained by addition reaction of the aforementioned phenols with formaldehyde using an alkali catalyst, novolac obtained by condensation reaction of the aforementioned phenols with formaldehyde using an acid catalyst and the like.
  • condensates e.g., alkylphenolic resin, xyleneformaldehyde-based resin and the like
  • various phenols e.g., phenol, m-cresol, 3,5-xylenol, p-alkylphenol, resorcin etc.
  • formaldehyde resol obtained by addition reaction of the a
  • rosin-based tackifier resin examples include unmodified rosin (natural rosin) such as gum rosin, wood rosin, tall oil rosin and the like, modified rosin (hydrogenated rosin, disproportionated rosin and polymerized rosin, and other chemically-modified rosin etc.) obtained by modifying the above unmodified rosins by hydrogenation, disproportionation polymerization and the like, various rosin derivatives and the like.
  • rosin esters such as esterified compound of rosin obtained by esterifying unmodified rosin with an alcohol and esterified compound of modified rosin obtained by esterifying modified rosin, hydrogenated rosin, disproportionated rosin, polymerized rosin and the like) with an alcohol and the like; unsaturated fatty acid-modified rosins obtained by modifying unmodified rosin or modified rosin (hydrogenated rosin, disproportionated rosin, polymerized rosin etc.) with unsaturated fatty acid; unsaturated fatty acid-modified rosin ester obtained by modifying rosin ester with an unsaturated fatty acid; rosin alcohols obtained by reduction-treating a carboxyl group in unmodified rosin, modified rosin (hydrogenated rosin, disproportionated rosin, polymerized rosin etc.), unsaturated fatty acid-modified rosins or unsaturated fatty acid
  • rosin derivative a rosin phenol resin obtained by adding phenol to rosins (unmodified rosin, modified rosin, various rosin derivatives etc.) with an acid catalyst and subjecting same to thermal polymerization and the like can also be used.
  • Examples of the alcohol to be used for obtaining the above-mentioned rosin esters include divalent alcohols such as ethylene glycol, diethylene glycol, propylene glycol, neopentyl glycol and the like, trivalent alcohols such as glycerol, trimethylolethane, trimethylolpropane and the like, tetravalent alcohols such as pentaerythritol, diglycerol and the like, hexahydric alcohols such as dipentaerythritol etc. and the like. These are used alone or in a combination of two or more kinds thereof.
  • divalent alcohols such as ethylene glycol, diethylene glycol, propylene glycol, neopentyl glycol and the like
  • trivalent alcohols such as glycerol, trimethylolethane, trimethylolpropane and the like
  • tetravalent alcohols such as pentaerythritol, diglycerol and the like
  • Examples of the petroleum-based tackifier resin include known petroleum resins such as aromatic petroleum resin, aliphatic petroleum resin, alicyclic petroleum resin (aliphatic cyclic petroleum resin), aliphatic aromatic petroleum resin, aliphatic alicyclic petroleum resin, hydrogenated petroleum resin, coumarone resin, coumarone indene resin and the like.
  • aromatic petroleum resin examples include polymers using one or more kinds of vinyl group-containing aromatic hydrocarbon having 8 to 10 carbon atoms (styrene, o-vinyltoluene, m-vinyltoluene, p-vinyltoluene, ⁇ -methylstyrene, ⁇ -methylstyrene, indene, methylidene etc.) and the like.
  • aromatic petroleum resin an aromatic petroleum resin obtained from a fraction such as vinyltoluene, indene and the like (i.e., “C9 petroleum fraction”) (namely, “C9 petroleum resin”) can be used preferably.
  • Examples of the aliphatic petroleum resin include polymers obtained by using one or more kinds selected from dienes such as olefin having 4 or 5 carbon atoms (e.g., butene-1, isobutylene, pentene-1 etc.), butadiene, piperylene, 1,3-pentadiene, isoprene etc., and the like. Furthermore, as the aliphatic petroleum resin, an aliphatic petroleum resin obtained from a fraction such as butadiene, piperylene, isoprene and the like (i.e., “C4 petroleum fraction”, “CS petroleum fraction” etc.) (namely, “C4 petroleum resin”, “C5 petroleum resin” etc.) can be used preferably.
  • the alicyclic petroleum resin examples include an alicyclic hydrocarbon resin obtained by cyclization and dimerization of an aliphatic petroleum resin (i.e., “C4 petroleum resin”, “C5 petroleum resin” etc.), followed by polymerization, a polymer of a cyclic diene compound (cyclopentadiene, dicyclopentadiene, ethylidenenorbornane, dipentene, ethylidenebicycloheptene, vinylcycloheptene, tetrahydroindene, vinylcyclohexene, limonene etc.) or a hydrogenated resin thereof, an alicyclic hydrocarbon resin obtained by hydrogenating the aromatic ring of the aforementioned aromatic hydrocarbon resin, the following aliphatic aromatic petroleum resin and the like.
  • a cyclic diene compound cyclopentadiene, dicyclopentadiene, ethylidenorbornane, dipentene, ethylidene
  • aliphatic aromatic petroleum resin examples include a styrene-olefin copolymer and the like.
  • a so-called “C5/C9 copolymerization petroleum resin” and the like can be used as the aliphatic aromatic petroleum resin.
  • the tackifier resin is preferably terpene-based tackifier resin and/or rosin-based tackifier resin, particularly preferably rosin-based tackifier resin, from the aspect of flame retardancy of a sheet.
  • the terpene tackifier resin and rosin-based tackifier resin easily provide effect as flame retardant auxiliary agents. Using these, adhesion of a sheet to an adherend and the flame retardancy of a sheet can be improved.
  • the terpene-based tackifier resin is particularly preferably a terpenephenol resin
  • the rosin-based tackifier resin is particularly preferably rosin ester (i.e., esterified compound of unmodified rosin, hydrogenated rosin, disproportionated rosin or polymerized rosin)
  • the rosin ester is preferably trivalent or higher polyhydric alcohol ester, particularly preferably tetra to hexahydric polyhydric alcohol ester.
  • One or more kinds of the tackifier resins can be used in combination, and the amount thereof to be used is not particularly limited. However, it is preferably not less than 5 parts by weight, more preferably not less than 10 parts by weight, particularly preferably not less than 15 parts by weight, relative to 100 parts by weight of the adhesive, since it becomes a carbon source and sufficiently exhibits the effect of a phosphorus flame retardant as an auxiliary agent. From the aspects of maintenance of adhesive property, preservability, handling property, dispersibility and the like, it is preferably not more than 100 parts by weight, more preferably not more than 60 parts by weight, particularly preferably not more than 40 parts by weight.
  • the pressure-sensitive adhesive layer 3 can contain, where necessary, various additives such as plasticizer, filler made of glass fiber, glass bead, metal powder, pigment, colorant, antioxidant, UV absorber and the like.
  • the thickness of the pressure-sensitive adhesive layer 3 is preferably 1-40 mil, more preferably 15-25 mil.
  • the thickness of the pressure-sensitive adhesive layer 3 is within such preferable range, the maintenance of a wrapped state of roll products 51 , 52 made of sheet 10 and handling efficiency and the like as a sheet are further improved.
  • the thickness of the whole sheet that is, the total thickness of elastomer layer 1 having a Shore A hardness of less than 40, core material 2 and pressure-sensitive adhesive layer 3 is preferably 3-90 mil, more preferably 30-70 mil.
  • the total thickness is within such preferable range, the maintenance of a wrapped state of roll products 51 , 52 made of sheet 10 and handling efficiency and the like as a sheet are further improved.
  • release liner 4 As release liner 4 , (a) a release-treated layer with a release agent is formed at least one face of a substrate for a release liner, (b) low adhesive substrate composed of a fluorinated polymer (e.g., polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene, polyvinyl fluoride, polyvinyl idene fluoride, tetrafluoroethylene.hexafluoropropylene copolymer, chlorofluoroethylene.vinylidene fluoride copolymer etc.), (c) a low adhesive substrate composed of a non-polar polymer (e.g., olefin-based resin such as polyethylene, polypropylene and the like, and the like), (d) conventionally used peel paper (crepe paper, embossed paper, Japanese paper, fiber paper etc.) and the like can be used.
  • a fluorinated polymer e.g., polytetrafluor
  • the substrate for a release liner examples include plastic substrates such as polyester film (poly(ethylene terephthalate) film etc.), olefin-based resin film (polyethylene (PE) film, polypropylene (PP) film etc.), polyvinyl chloride film, polyimide film, polyamide film (nylon film), rayon film and the like, paper (quality paper, Japanese paper, craft paper, glassine, synthetic paper, top-coat paper and the like), multi-layered product (composite of 2-3 layers) of these by lamination, coextrusion and the like and the like.
  • plastic substrates such as polyester film (poly(ethylene terephthalate) film etc.), olefin-based resin film (polyethylene (PE) film, polypropylene (PP) film etc.), polyvinyl chloride film, polyimide film, polyamide film (nylon film), rayon film and the like, paper (quality paper, Japanese paper, craft paper, glassine, synthetic paper, top-coat paper and the like), multi-layered product (compo
  • a silicone-based release agent a fluorinated release agent, a long chain alkyl-based release agent and the like are used.
  • a release agent that forms a release-treated layer is preferably a fluorosilicone-based release agent, particularly preferably a fluorosilicone-based release agent cation-polymerized by UV radiation.
  • a release-treated layer is formed by applying a coating solution obtained by dissolving or dispersing a release agent in an organic solvent to at least one face of a substrate for a release liner with a general coating apparatus such as roll coater, reverse coater, doctor blade coater and the like, and drying same. While the coating amount (solid content) of the release agent is not particularly limited, it is generally about 0.05-6 mg/cm 2 .
  • the thickness (thickness of substrate for release liner, thickness of low adhesive substrate) of the release liner is preferably about 0.5-5 mil, more preferably about 2-3 mil. When the thickness is in such preferable range, the flexibility, handling workability and the like of the release liner are further improved.
  • the release liner one using PE film, PP film and the like as a substrate for a release liner, or a low adhesive substrate composed of PE, PP or PTFE is preferable from the aspect of flexibility.
  • Sheet 11 in the second form (sheet having laminate constitution of elastomer layer 1 having a Shore A hardness of less than 40/core film 2 /elastomer layer 1 having a Shore A hardness of less than 40) ⁇ Elastomer Layer 1 Having a Shore A Hardness of Less than 40>
  • the thickness of the elastomer layer 1 having a Shore A hardness of less than 40 is preferably 2-40 mil, more preferably 15-35 mil.
  • the thickness of the elastomer layer 1 is within such preferable range, the maintenance of a wrapped state of a roll product 53 and handling property as a sheet become more superior.
  • the thickness of the core material 2 is preferably 0.5-10 mil, more preferably 2-7 mil.
  • the thickness of the core material 2 is within such preferable range, the maintenance of a wrapped state of a roll product and handling efficiency as a tape are further improved.
  • the thickness of the whole sheet that is, the total thickness of elastomer layer 1 having a Shore A hardness of less than 40, core material 2 and elastomer layer 1 having a Shore A hardness of less than 40 is preferably 4-90 mil, more preferably 30-80 mil.
  • the total thickness is within such preferable range, the maintenance of a wrapped state of a roll product 53 and handling efficiency and the like as a sheet are further improved.
  • release liner 4 follow those of release liner 4 of the above-mentioned sheet 10 in the first form.
  • Sheet 12 in the third form (single layer sheet having only elastomer layer 1 having a Shore A hardness of less than 40) ⁇ Elastomer Layer 1 Having a Shore A Hardness of Less than 40>
  • the thickness of the elastomer layer 1 having a Shore A hardness of less than 40 is preferably 2-40 mil, more preferably 15-35 mil.
  • the thickness of the elastomer layer 1 is within such preferable range, the maintenance of a wrapped state of a roll product 54 and handling property as a sheet become more superior.
  • release liner 4 follow those of release liner 4 of the above-mentioned sheet 10 in the first form.
  • Sheet 13 in the fourth form (sheet having laminate constitution of elastomer layer 1 having a Shore A hardness of less than 40/core material 2 /elastomer layer 1 having a Shore A hardness of less than 40/substrate 5 ) ⁇ Elastomer Layer 1 Having a Shore A Hardness of Less than 40>
  • the thickness of these two elastomer layers 1 is preferably 2-40 mil, more preferably 15-35 mil. When the thickness of the elastomer layer 1 is within such preferable range, the maintenance of a wrapped state of a roll product 56 and handling efficiency as a sheet become further superior.
  • the thickness of the core material 2 is preferably 0.5-10 mil, more preferably 1-3 mil.
  • the thickness of the core material 2 is within such preferable range, the maintenance of a wrapped state of a roll product 55 and handling efficiency as a sheet become more superior.
  • the material of substrate 5 is not particularly limited. Examples thereof include a single layer or laminate plastic film made from one or more kinds selected from polyester (e.g., poly(ethylene terephthalate) (PET) and the like); nylon; polyvinyl chloride; polyvinylidene chloride; polyolefin (e.g., polyethylene, polypropylene, reactor TPO, ethylene-vinyl acetate copolymer and the like); fluororesin (e.g., polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene (PCTFE), polyvinylidene fluoride (PVDF), polyvinyl fluoride (PVF), perfluoroalkoxyfluororesin (PFA), tetrafluoroethylene hexafluoropropylene copolymer (FEP), ethylene tetrafluoroethylene copolymer (ETFE), ethylene chlorotrifluoroethylene copolymer (ECTFE) and the like, a
  • a fiber sheet (a single layer sheet, laminated sheet of two or more layers) such as knitted fabric, woven fabric, non-woven fabric and the like using one or more kinds of fibers selected from synthetic polymer fibers such as polyester (e.g., poly(ethylene terephthalate) (PET) and the like) and the like, natural fibers such as cotton, hemp and the like, metal fiber and glass fiber, and a laminated sheet wherein one or more kinds of such fiber sheets are laminated on the aforementioned plastic film can also be used as a substrate.
  • synthetic polymer fibers such as polyester (e.g., poly(ethylene terephthalate) (PET) and the like) and the like
  • PET poly(ethylene terephthalate)
  • natural fibers such as cotton, hemp and the like
  • metal fiber and glass fiber and a laminated sheet wherein one or more kinds of such fiber sheets are laminated on the aforementioned plastic film can also be used as a substrate.
  • the thickness of substrate 5 is preferably 0.5-10 mil, more preferably 2-7 mil. When the thickness of the substrate is within such preferable range, adhesion of sheet 13 to an adherend and peel workability during maintenance can be improved further.
  • the thickness of the whole sheet that is, the total thickness of elastomer layer 1 having a Shore A hardness of less than 40, core material 2 , elastomer layer 1 having a Shore A hardness of less than 40 and substrate 5 is preferably 5-100 mil, more preferably 30-80 mil.
  • the total thickness is within such preferable range, the maintenance of a wrapped state of a roll product 55 and handling efficiency and the like as a sheet are further improved.
  • release liner 4 follow those of release liner 4 of the above-mentioned sheet 10 in the first form.
  • Sheet 14 in the fifth form (sheet having laminate constitution of elastomer layer 1 having a Shore A hardness of less than 40/substrate 5 ) ⁇ Elastomer Layer 1 Having a Shore A Hardness of Less than 40>
  • the thickness of the elastomer layer 1 having a Shore A hardness of less than 40 is preferably 2-40 mil, more preferably 15-35 mil.
  • the thickness of the elastomer layer 1 having a Shore A hardness of less than 40 is within such preferable range, the maintenance of a wrapped state of a roll product 56 and handling efficiency as a sheet are further improved.
  • the thickness of the whole sheet that is, the total thickness of elastomer layer 1 having a Shore A hardness of less than 40 and substrate 5 is preferably 2.5-50 mil, more preferably 17-42 mil.
  • the total thickness is within such preferable range, the maintenance of a wrapped state of a roll product 56 and handling efficiency and the like as a sheet are further improved.
  • release liner 4 follow those of release liner 4 of the above-mentioned sheet 10 in the first form.
  • the sheet of the present invention does not easily absorb moisture and has preferable property for achieving moisture-proof and/or anticorrosion by adhesion to an adherend. That is, the sheet of the present invention shows a moisture absorption percentage of not more than 2.5% (preferably not more than 1.0%) as measured according to ASTM D570.
  • step liner means a liner (sheet, film) used in the production step, which is not included in the final product (the sheet of the present invention).
  • First step An elastomer layer 1 is formed on a core material 2 by coating, and a release liner 4 (at least one face is release-treated) is laminated thereon.
  • a pressure-sensitive adhesive layer 3 is formed on a step liner by coating, and the pressure-sensitive adhesive layer 3 is laminated on the back face of the core material 2 that went through the first step.
  • the press condition for lamination is preferably about 5-7 kgf/cm 2 .
  • one of the release liners (step liner) is peeled off, and the sheet is wound up in a roll such that the forming face of the pressure-sensitive adhesive layer 3 contacts the release-treated face of at least one face and the other release liner 4 , that is, pressure-sensitive adhesive layer 3 being the inside, and the elastomer layer 1 and the release liner 4 being the outside.
  • First step An elastomer layer 1 is formed on a core 2 by coating, and a step liner is laminated on elastomer layer 1 as necessary.
  • a pressure-sensitive adhesive layer 3 is formed on a release liner 4 (at least one face is release-treated), the pressure-sensitive adhesive layer 3 is laminated on the back face of the core material 2 that went through the first step, the step liner is peeled off as necessary, and the sheet is rolled up.
  • the press condition for lamination is preferably about 5-7 kgf/cm 2 .
  • one of the release liners (step liner) is peeled off, and the sheet is wound up in a roll with single face on the opposite side from the forming face of the pressure-sensitive adhesive layer 3 of the other release liner 4 being the outside face and the elastomer layer 1 being the inside face.
  • First step An elastomer layer 1 is formed by coating on a core 2 by coating, and a step liner is adhered.
  • Second step The elastomer layer 1 is coated on the back face of the core 2 that went through the first step, a release liner 4 (at least one face is release-treated, and double faces have different peel forces) is adhered, the step liner is peeled off, and the sheet is rolled up.
  • a release liner 4 at least one face is release-treated, and double faces have different peel forces
  • the press condition for lamination is preferably about 5-7 kgf/cm 2 . Thereafter, one of the release liners is peeled off, and the sheet is wound up in a roll with a single face of the other release liner on the opposite side from the forming face of the elastomer layer 1 having a Shore A hardness of less than 40 being the outside face.
  • an elastomer layer 1 having a Shore A hardness of less than 40 is formed on a single face of a release liner (double faces are release-treated), and the sheet is wound up in a roll with the single face of the release liner on the opposite side from the forming face of the elastomer layer 1 having a Shore A hardness of less than 40 being the outside face.
  • a release liner is prepared, an elastomer layer 1 having a Shore A hardness of less than 40 is formed on a single face of the release liner, and a core 2 is adhered to the elastomer layer 1 . Then, an elastomer layer 1 having a Shore A hardness of less than 40 is formed on one single face (single face without release treatment, or single face after adhesion improving treatment in the case of low adhesive substrate) of substrate 5 that went through a release-treatment of the other single face (back face), and the elastomer layer 1 having a Shore A hardness of less than 40 is press laminated on the single face of core 2 .
  • the press condition therefor is preferably about 5-7 kgf/cm 2 .
  • the release liner is peeled off, and the sheet is wound up in a roll with the release-treated single face of the substrate 5 being the outside face.
  • an elastomer layer 1 having a Shore A hardness of less than 40 is formed on one single face (single face without release treatment, or single face after adhesion improving treatment in the case of low adhesive substrate) of substrate 5 that went through a release-treatment of the other single face (back face), and the sheet is wound up in a roll with the release-treated single face of the substrate 4 being the outside face.
  • a sheet is cut into a 3 inch ⁇ 3 inch flat plane size, and adhered to a 4 inch ⁇ 4 inch (flat plane size) aluminum panel. After one reciprocation with a 2 kg roller, the sheet is aged for 24 hr at ambient temperature to give a test sample.
  • the sample was subjected to a salt water spray test under the following conditions.
  • test time 250 hr, 500 hr
  • the sheet After the test, the sheet is detached from the aluminum panel, and the ratio of the corroded area to the whole area of the region, to which the sheet has been adhered, is determined. When a corroded part is not less than 1%, the sheet is evaluated as disqualified, and when the corroded part is less than 1%, the sheet is evaluated as qualified. The corrosion was determined by visual observation.
  • test sample is aged for 24 hr at room temperature, heated in an oven at 70° C. for 48 hr, taken out and the panel is peeled off 30 min later.
  • the evaluation criteria are as follows.
  • Sheet can be peeled off easily with hand without using special tool or method. No adhesive residue after peeling the sheet from the panel.
  • Peeling off from the panel only with hand is difficult and can be peeled off only by expanding the gap with a screwdriver and the like. No adhesive residue after peeling the sheet from the panel.
  • flame retardant 1 FRCROS486* 2 manufactured by BUDENHEIM, 50 parts by weight
  • flame retardant 2 TCP* 3 manufactured by Rit-Chem, 30 parts by weight
  • tackifier PENSEL D-125* 4 manufactured by Arakawa Chemical Industries, 20 parts by weight
  • crosslinking agent SILYL CR500* 5 manufactured by KANEKA, 7.65 parts by weight
  • reaction control agent 3-Methyl-1-butyn-3-ol manufactured by TCI America, 0.05 parts by weight
  • An elastomer composition was applied to one of the single faces of PTFE film, dried in an oven at 130° C. for 3 min (thickness after drying 30 mil), and a release liner (S2 CL PET 5100/5100 manufactured by Loparex) was laminated with a hand roller.
  • a pressure-sensitive adhesive was applied to a single face of the same another release liner, dried in an oven at 130° C. for 3 min (thickness after drying 20 mil), and the obtained pressure-sensitive adhesive layer was laminated on the other single face of the PTFE film of (1) with a hand roller.
  • the elastomer composition in the above-mentioned (1) was changed to polyoxyalkylene-based adhesive or polyurethane-based adhesive, and the above-mentioned (1) and (2) were performed.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Adhesive Tapes (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
US15/563,761 2015-04-08 2016-04-07 Sheet, moisture-proof method of adherend using the sheet and corrosion-proof method of metal plate using the sheet Abandoned US20180093451A1 (en)

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US201562144536P 2015-04-08 2015-04-08
PCT/US2016/026361 WO2016164535A1 (en) 2015-04-08 2016-04-07 Sheet, moisture–proof method of adherend using the sheet and corrosion–proof method of metal plate using the sheet
US15/563,761 US20180093451A1 (en) 2015-04-08 2016-04-07 Sheet, moisture-proof method of adherend using the sheet and corrosion-proof method of metal plate using the sheet

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US16/837,174 Abandoned US20200290312A1 (en) 2015-04-08 2020-04-01 Sheet, moisture-proof method of adherend using the sheet and corrosion-proof method of metal plate using the sheet
US17/473,026 Pending US20210402738A1 (en) 2015-04-08 2021-09-13 Sheet, moisture-proof method of adherend using the sheet and corrosion-proof method of metal plate using the sheet

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US20210402738A1 (en) 2021-12-30
JP6971846B2 (ja) 2021-11-24
US20200290312A1 (en) 2020-09-17
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WO2016164535A1 (en) 2016-10-13
CN107405863A (zh) 2017-11-28

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